Abstract
In this paper we study the effects of intermetallic nanoparticles likeNi3Al on the evolution of vacancy defects in the fcc Fe–Ni–Al alloy under electron irradiationusing positron annihilation spectroscopy. It was shown that the nanosized(∼4.5 nm) intermetallic particles homogeneously distributed in the alloy matrix causeda several-fold decrease in the accumulation of vacancies as compared to theiraccumulation in the quenched alloy. This effect was enhanced with the irradiationtemperature. The irradiation-induced growth of intermetallic nanoparticles was alsoobserved in the pre-quenched Fe–Ni–Al alloy under irradiation at 573 K. Thus, aquantum-dot-like positron state in ultrafine intermetallic particles, which we revealedearlier, provided the control over the evolution of coherent precipitates, along withvacancy defects, during irradiation and annealing. Possible mechanisms of theabsorption of point defects by coherent nanoparticles have been discussed too.
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